Psittacofulvin

Psittacofulvin pigments are responsible for the bright-red, orange, and yellow colours of parrots.^[1] They consist of linear polyenes terminated by an aldehyde group.^[2] Colourful feathers with high levels of psittacofulvin resist feather-degrading Bacillus licheniformis better than white ones.^[3]

References

↑ J. F. Masello, T. Lubjuhn, P. Quillfeldt (2008). Is the structural and psittacofulvin-based coloration of wild burrowing parrots Cyanoliseus patagonus condition dependent? Journal of Avian Biology, Volume 39, Number 6, November 2008 , pp. 653-662(10), doi:10.1111/j.1600-048X.2008.04417.x
↑ Stradi, R.; Pini, E.; Celentano, G. "The chemical structure of the pigments in Ara macao plumage". Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology. 130 (1): 57–63. doi:10.1016/s1096-4959(01)00402-x.
↑ Edward H. Burtt, Max R. Schroeder, Lauren A. Smith, Jenna E. Sroka, Kevin J. McGraw (2010): Colourful parrot feathers resist bacterial degradation, Biology Letters, The Royal Society, doi:10.1098/rsbl.2010.0716.

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[1] J. F. Masello, T. Lubjuhn, P. Quillfeldt (2008). Is the structural and psittacofulvin-based coloration of wild burrowing parrots Cyanoliseus patagonus condition dependent? Journal of Avian Biology, Volume 39, Number 6, November 2008 , pp. 653-662(10), doi:10.1111/j.1600-048X.2008.04417.x

[2] Stradi, R.; Pini, E.; Celentano, G. "The chemical structure of the pigments in Ara macao plumage". Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology. 130 (1): 57–63. doi:10.1016/s1096-4959(01)00402-x.

[3] Edward H. Burtt, Max R. Schroeder, Lauren A. Smith, Jenna E. Sroka, Kevin J. McGraw (2010): Colourful parrot feathers resist bacterial degradation, Biology Letters, The Royal Society, doi:10.1098/rsbl.2010.0716.